A Semi-Open Game is a chess opening in which White plays 1.e4 and Black breaks symmetry immediately by replying with a move other than 1...e5. The Semi-Open Games are also called Single King Pawn Games, and are the complement of the Open Games or Double King Pawn Games which begin 1.e4 e5. The most popular Black defense to 1.e4 is the Sicilian, but the French and the Caro-Kann are also very popular. The Pirc and the Modern are also commonly seen, while the Alekhine and the Scandinavian have made occasional appearances in World Chess Championship games. The Nimzowitsch is playable but rare, as is Owen's Defense. The Grob Defense and the St. George Defense are oddities, although Tony Miles once used St. George's Defense to defeat then World Champion Anatoly Karpov.
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